* {
  margin: 0;
  padding: 0;
}

.box {
  width: 600px;
  height: 600px;
  margin: 0 auto;
  border: 5px solid gray;
  transform-style: preserve-3d;
  /* 做3D必加 */
  position: relative;
  transform: rotateY(30deg) rotateX(30deg);
  animation: run 5s linear infinite;
}

@keyframes run {
  0% {
    transform: rotateY(30deg) rotateX(30deg);
  }

  50% {
    transform: rotateY(300deg) rotateX(300deg);
  }

  100% {
    transform: rotateY(30deg) rotate(30deg);
  }
}

.box div {
  width: 200px;
  height: 200px;
  /* background: ; */
  position: absolute;
  left: 50%;
  top: 50%;
  margin-left: -100px;
  margin-top: -100px;
  line-height: 200px;
  text-align: center;
  font-size: 50px;
  color: white;
  opacity: 0.7;
}

.box div:nth-child(1) {
  background: gray;
  transform: translateZ(100px);
}

.box div:nth-child(2) {
  background: cadetblue;
  transform: translateX(-100px) rotateY(-90deg);
}

.box div:nth-child(3) {
  background: purple;
  transform: translateY(-100px) rotateX(90deg);
}

.box div:nth-child(4) {
  background: green;
  transform: translateY(100px) rotateX(-90deg);
}

.box div:nth-child(5) {
  background: red;
  transform: translateX(100px) rotateY(90deg);
}

.box div:nth-child(6) {
  background: darkblue;
  transform: translateZ(-100px) rotateY(360deg) rotateX(-180deg);
}